Same as it ever was
Excellent bit 'o snark..
" So it pulled the People feature into a standalone app, and invited services to write to a new API. Nobody did, and so the People app became a neglected shadow of its former self.
Without really trying to, Microsoft had just snuffed out Windows Phone's "killer feature". But last October, Microsoft announced that platform-level contact integration would return to Windows via a "universal contacts database". There would be a new API and Microsoft invited developers including social media services to write to it."